Sideboard



FIG. 1 is a left front perspective view of a sideboard showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image thereof;

FIG. 4 is a top view thereof;

FIG. 5 is an enlarged partial perspective view of the upper right corner thereof; and,

FIG. 6 is an enlarged partial view of the door carving.

The broken line showing of environmental elements is for illustrative purposes only and forms no part of the claimed design.

The bottom and rear views of the design are not shown and form no part of the claimed design. 

The ornamental design for a sideboard, as shown and described. 